[rules-dev] Long DSL lines

[Wolfgang Laun]

Currently each entry must be a single line of text. This results in long
lines, especially on the RHS.

I have experimentally inserted a transformation of the DSL text (in
DSLTokenizedMappingFile)
which converts '\'+EOL on the fly to a space. (The passed-in reader is read
into a buffer, '\'+EOL
is translated to space, and EOLs are inserted later to readjust the line
number.) In a text editor,
I can now write, e.g.,

then][][Bb]ook the customer for the flight=\
  $f.setAvailable( $f.getAvailable() - 1 );\
  update( $f );                            \
  Booking booking = new Booking();         \
  booking.setCustomer( $r.getCustomer() ); \
  booking.setFlight( $f );                 \
  insert( booking );

Of course, the DSL editor will not preserve this, but future development
might provide more
convenient editing there, too.

Any objections?
-W
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